Remote control dual button hand switch



. June 20, 1939. c. STRINGER REMOTE CONTROL DUAL BUTTON HAND SWITCH Filed April 29, 1957 Patented June 20, 1939 UNITED STATES REMOTE CONTROL DUAL BUTTON HAND SWI TOH

Louis 0. Stringer, Chicago, Ill., assignor to Electronics Supply Corp., a corporation of Delaware Application April 29, 1937, Serial No. 139,823

1 Claim.

The present invention relates to what is believed to be a unique tool holder having incorporated therein a sensitive conveniently located dual-type switch affording the user appreciable means to positively control the current at will.

Certain classes of precision work make it desirable to have the tool in the hand-grip type holder under constant control. For example, in the jewelry trade where drills and welding tools are employed for refined workmanship, it becomes necessary to instantly and momentarily throw the tool out of operation. It is desirable to do this, for instance, without bodily shifting the tool from the spot on which it has been focused or trained, allowing inspection to be made, after which the tool is again set into operation to operate on the same identical spot. If the hand is shifted it is sometimes diflicult to re-locate the exact point being worked on.

It follows, therefore, that I have discovered the need for a tool holder having a circuit make and break device or switch embodied therein, whereby the tool may be thrown momentarily out of operation without shifting the position of the tool holder in relation to the work. In reducing to practice the principles of the present invention, I have evolved and produced an ingenious and simple switch construction enabling the desired results to be reliably and satisfactorily attained.

Other features and advantages of the invention will become more readily apparent from the following description and drawing.

In the drawing:

Figure 1 is a view partly in section and partly in elevation of a tool holder embodying a switch construction developed in accordance with my inventive ideas.

Figure 2 is a horizontal section on the plane of the line 2-2 of Figure 1.

Figure 3 is a fragmentary side elevational 'view observing Figure 1 in a direction from either right or left.

The holder for the electric tool 4 is unitarily denoted by the numeral 5. It is preferably constructed from insulation material of appropriate texture and strength. The major or body portion is fashioned to provide a comfortable or convenient hand-grip 6. The outer end is fashioned to form a socket I, this being lined with a screwthreaded shell 8 to accommodate the screw plug 9 on the shank of the tool. Incidentally, different types of tools are designed to fit into this holder, for example, drills, welding irons, and the like. In the construction of the body 5, it is provided with a main longitudinal bore 6a to accommodate the conductor wire l0 and the complemental circuit make and break or switch wires I! and I2. The positive and negative wire-ends I3 and I4 are arranged in grooves in the upper chamber I5, where they are connected with the contact button l6 and shell 8, respectively, thus supplying current to the tool 4 in a more or less conventional manner.

The numeral I! designates an adapter neck projecting into the upper portion of the bore Ba, and located in the chamber I8. The chamber I8 is provided with diametrically opposite handholes with a removable cover plate l9 held in place by fastenin s 20.

The aforementioned wires l I extend up through the bore 6a, where they are connected with binding screws 2| accessible by way of the removable plates l9, said binding screws serving to hold in place resilient or spring fingers 22. On the upper ends of the fingers 22 are U-shaped contact clips 23 controlled by the duplicate simultaneously operable push buttons 24 and 25, respectively. The inherent resiliency of the fingers 22 is such as to normally maintain the clips 23 in contact with each other, whereby to keep the current on until the buttons 24 and 25 are depressed or forced inwardly toward each other.

It is understood that in remote control electric: tool holders of this type it is highly desirable to have a temporary cut-out built into the tool holder where it will be under constant control of the user. Moreover, in such an arrangement the current to the tool is regulated through a selector which (not shown) is located at the source of power (also not shown). The four wires l3, l4, and H and I2 are thus embodied in this power governed circuit feeding the tool 4. Normally, the current is always on. When, however, it is desired to momentarily throw it off, the dual control switch comes in handy for the purpose.

In practice, assuming that a precision job is being worked on and the tool 4 has been properly focused on the exact spot desired, it is undesirable to shift the hand or bodily move the tool or tool holder. At the same time, it is desirable to inspect the spot being worked on, thus making it necessary to throw the tool 4 out of operation for a moment. The provision of the two buttons 24 and 25 diametrically opposit each other puts one in the position to be pressed by the thumb and the other one by the index finger of the same hand. Consequently, by squeezing the button, the position of the hand does not have to be changed. At the same time, current can be cut holder of the class described, a hand grip longitudinally bored, a pair of resilient fingers mounted in said hand grip, current control wires connected with the respective fingers, said fingers being disposed in opposed parallelism, the inherent resiliency of the fingers serving 'to spread the same apart, a pair of substantially U-shaped contact clipson the free ends of said fingers, the clips being interlocked into normal contacting relationship, a pair of control finger buttons attached to the free ends of said fingers, said hand grip having passages therein for said buttons.

LOUIS C. STRIN GER. 

